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Related Parties and Variable Interest Entity - Additional Information (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 30, 2020 shares | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) shares | Sep. 30, 2023 USD ($) | Feb. 29, 2024 | Dec. 31, 2023 USD ($) | Feb. 28, 2023 USD ($)
Related Parties And Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Operating lease expense |  |  |  |  | $ 8,013,000 | $ 9,210,000 |  |  |
Income from Sublease |  | $ 100,000 |  | $ 200,000 | $ 300,000 | 500,000 |  |  |
loan Issued |  |  |  |  |  |  |  | $ 400,000 |
Variable interest management fee |  |  |  |  | 1 |  |  |  |
Dividend |  |  | $ 17,300,000 |  |  |  |  |  |
NAVER | Private Placement | Common Stock |  |  |  |  |  |  |  |  |
Related Parties And Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Shares of common stock | shares |  |  |  |  | 2,380,952 |  |  |  |
Aggregate purchase price |  |  |  |  | $ 50,000,000 |  |  |  |
Related Parties | NAVER |  |  |  |  |  |  |  |  |
Related Parties And Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
loan Issued |  |  |  |  |  |  |  |  | $ 11,600,000
Fixed interest pecentage |  |  |  |  |  |  | 4.60% |  | 5.26%
Dividend |  |  |  |  | 16,600,000 |  |  |  |
Related Parties | NAVER | Leasing Office Space |  |  |  |  |  |  |  |  |
Related Parties And Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Operating lease expense |  | 1,600,000 |  | 1,600,000 | 4,600,000 | 4,700,000 |  |  |
Lease obligation |  | 3,100,000 |  |  | 3,100,000 |  |  | $ 21,300,000 |
Income from Sublease |  | 100,000 |  | 200,000 | 200,000 | 500,000 |  |  |
Non-Employee Director | Stock Options [Member] |  |  |  |  |  |  |  |  |
Related Parties And Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Stock options exchange for non-director services | shares | 2,832,270 |  |  |  |  |  |  |  |
eBOOK Initiative Japan Co., Ltd. |  |  |  |  |  |  |  |  |
Related Parties And Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Total gross reimbursement costs received |  | 4,700,000 |  | 0 | 16,800,000 | 0 |  |  |
eBOOK Initiative Japan Co., Ltd. | Cost of Revenue |  |  |  |  |  |  |  |  |
Related Parties And Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Total gross reimbursement costs received |  | 2,600,000 |  | 0 | 10,200,000 | 0 |  |  |
eBOOK Initiative Japan Co., Ltd. | Marketing |  |  |  |  |  |  |  |  |
Related Parties And Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Total gross reimbursement costs received |  | 1,800,000 |  | 0 | 5,300,000 | 0 |  |  |
eBOOK Initiative Japan Co., Ltd. | General and Administrative Expenses |  |  |  |  |  |  |  |  |
Related Parties And Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Total gross reimbursement costs received |  | $ 300,000 |  | $ 0 | $ 1,200,000 | $ 0 |  |  |

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